Circuit breaker system and circuit breaker operation control device

Abstract

To provide a circuit breaker system that can improve the operational accuracy of the circuit breaker. [Solution] The first closing operation control signal S19A is output so that the first biasing drive solenoid for closing operation switches at the start of the first solenoid drive. The second closing operation control signal S19B is output so that the second biasing drive solenoid for closing operation switches at the start of the second solenoid drive, which is after a delay time has elapsed from the start of the first solenoid drive. The delay time is longer than the closing operation time between the start of the first solenoid drive and the start of the first closing operation, which is when the execution of the closing operation starts at the main contact part in response to the first closing operation control signal. If the first biasing drive solenoid for closing operation does not drive based on the first closing operation control signal and the closing operation is not executed, the second biasing drive solenoid for closing operation is driven based on the second closing operation control signal and the closing operation is executed.

Description

Technical Field

[0001] Embodiments of the present invention relate to a circuit breaker system and a circuit breaker operation control device.

Background Art

[0002] A circuit breaker is a type of switch that is provided to perform a closing operation (switching-on operation) of switching from an open state to a closed state in a power system, and also to perform an opening operation (circuit-breaking operation) of switching from a closed state to an open state in the power system.

[0003] When the circuit breaker performs a closing operation and an opening operation, switching surges (transient overvoltages) may occur in the power system depending on the voltage and current conditions. When the system voltage of the power system is high, the switching surge becomes a high voltage. For this reason, for example, in a circuit breaker installed in a line of a power system with a nominal voltage of 500 kV, a resistance switching method or a phase control switching method is applied particularly to suppress the surge voltage generated during the closing operation. In recent years, there has been a demand to simplify the configuration of the circuit breaker. In addition, in a control device using semiconductor elements, the response has been speeded up and the reliability has been increasing. For this reason, the application of the phase control switching method to the circuit breaker is expanding.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The circuit breaker is configured to perform a closing operation and an opening operation, for example, by an operating mechanism operating on a main contact portion.

[0006] Figures 6A, 6B, and 6C are schematic perspective views showing the main parts of the operating mechanism 28 that operates the main contact in the related technology. Here, the case where the operating mechanism 28 performs a closing operation is illustrated. Some parts of the part that performs the opening operation are omitted from the illustration, but it is configured in the same way as the part that performs the closing operation.

[0007] As shown in Figure 6A, in the circuit breaker, the operating mechanism 28 includes, for example, a first closing-operation biasing drive solenoid 26A and a second closing-operation biasing drive solenoid 26B. When a circuit breaker closing operation command is input to perform a closing operation, a closing operation control command is input to the first closing-operation biasing drive solenoid 26A, and at the same time, a closing operation control command is input to the second closing-operation biasing drive solenoid 26B. As a result, both the first closing-operation biasing drive solenoid 26A and the second closing-operation biasing drive solenoid 26B are simultaneously switched from a de-energized state DM (see Figure 6A) to an energized state EC (see Figure 6B).

[0008] As shown in Figure 6B, the biasing force drives both the first closing-operation biasing drive solenoid 26A and the second closing-operation biasing drive solenoid 26B simultaneously drives the solenoid armature, pushing up the catch 25 which constitutes the operation trigger. This releases the catch 25 from engaging with the cam 251, causing the cam 251 to move from its stopped state. As a result, the operating force of the main mechanism is transmitted to the main contact part (not shown), and the closing operation is performed.

[0009] As described above, in a circuit breaker, the circuit breaker closing operation command is multiplexed into, for example, two closing operation control commands and input to the first closing operation biasing drive solenoid 26A and the second closing operation biasing drive solenoid 26B, respectively. Therefore, even if, for example, a circuit break occurs and the first closing operation biasing drive solenoid 26A does not receive a closing operation control command, as shown in Figure 6C, the other second closing operation biasing drive solenoid 26B, which has received a closing operation control command, is driven simultaneously, and the closing operation is performed. Thus, the reliability of the circuit breaker's operation can be improved.

[0010] In the above case, the time that catch 25 is driven is the design value when both the first closing-operation biasing drive solenoid 26A and the second closing-operation biasing drive solenoid 26B are driven simultaneously (see Figure 6B). Therefore, when only one of the first closing-operation biasing drive solenoid 26A or the second closing-operation biasing drive solenoid 26B is driven (see Figure 6C), the driving force applied to catch 25 is smaller than when both are driven (see Figure 6B). As a result, the time that catch 25 is driven when only one is driven (see Figure 6C) is longer than the design value when both are driven (see Figure 6B). Also, if an error occurs between the operation of the first closing-operation biasing drive solenoid 26A and the operation of the second closing-operation biasing drive solenoid 26B, and they are not driven simultaneously, the time that catch 25 is driven will be longer than the design value, similar to when only one is driven (see Figure 6C).

[0011] Due to the circumstances described above, the operating accuracy of the circuit breaker may decrease, making it difficult to improve the reliability of the circuit breaker.

[0012] Therefore, the problem that the present invention aims to solve is to provide a circuit breaker system and a circuit breaker operation control device that can improve the operating accuracy of the circuit breaker. [Means for solving the problem]

[0013] The circuit breaker system of the embodiment comprises a circuit breaker and a circuit breaker operation control device for controlling the operation of the circuit breaker. The circuit breaker comprises a main contact section and an operating mechanism. The main contact section is provided in a power system and is configured to perform a closing operation in the power system, switching from an open state to a closed state, and an opening operation in the power system, switching from a closed state to an open state. The operating mechanism is configured to operate the main contact section by transmitting the operating force of the main mechanism section to the main contact section via an operating trigger section. The operating mechanism includes a first closing operation biasing drive solenoid and a second closing operation biasing drive solenoid. The first closing operation biasing drive solenoid performs a closing operation by driving an operating trigger section by switching from a demagnetized state to an excited state. The second closing operation biasing drive solenoid performs a closing operation by driving an operating trigger section by switching from a demagnetized state to an excited state. The circuit breaker operation control device comprises a first closing operation control unit and a second closing operation control unit. The first closing operation control unit is configured to receive a first closing operation command when executing a closing operation and to output a first closing operation control signal based on the first closing operation command. The second closing operation control unit is configured to receive a second closing operation command simultaneously with the first closing operation command when executing a closing operation and to output a second closing operation control signal based on the second closing operation command. The first closing operation control signal is output from the first closing operation control unit so that the first closing operation biasing drive solenoid switches from a demagnetized state to an excited state at the start of the first solenoid drive. The second closing operation control signal is output from the second closing operation control unit so that the second closing operation biasing drive solenoid switches from a demagnetized state to an excited state at the start of the second solenoid drive, after a delay time has elapsed from the start of the first solenoid drive. The delay time is longer than the closing operation time between the start of the first solenoid drive and the start of the first closing operation, when the closing operation is initiated at the main contact section in response to the first closing operation control signal.If the first biasing drive solenoid for closing the circuit is not driven based on the first closing operation control signal and the closing operation is not performed, the second biasing drive solenoid for closing the circuit is driven based on the second closing operation control signal and the closing operation is performed. [Brief explanation of the drawing]

[0014] [Figure 1A] Figure 1A is a schematic diagram showing the main components of the circuit breaker system according to the first embodiment. [Figure 1B] Figure 1B is a schematic diagram showing the configuration of the first closing operation anti-pumping unit 33A in the circuit breaker system according to the first embodiment. [Figure 1C] Figure 1C is a schematic diagram showing the configuration of the second closing operation anti-pumping unit 33B in the circuit breaker system according to the first embodiment. [Figure 1D] Figure 1D is a schematic perspective view showing the main parts of the operating mechanism 28 that constitutes the circuit breaker 12 in the first embodiment. [Figure 2A] Figure 2A is a timing chart for when the closing operation is performed under normal conditions in the first embodiment. [Figure 2B] Figure 2B is a timing chart for the first embodiment, showing when the closing operation is performed in the event of an abnormality in which the first closing operation biasing drive solenoid 26A is not driven. [Figure 3A] Figure 3A is a timing chart for the circuit breaker system of the second embodiment, when the circuit closing operation commands S14A and S14B are still in effect after the completion of the circuit closing operation, and the circuit opening operation commands S14AX and S14BX are received. [Figure 3B] Figure 3B is a timing chart for the comparative example, where, after the completion of a closing operation, the closing operation commands S14A and S14B are still in effect, and the opening operation commands S14AX and S14BX are received to execute an opening operation. [Figure 4A] Figure 4A is a schematic diagram showing the main components of the circuit breaker system according to the third embodiment. [Figure 4B]FIG. 4B is a timing chart when a closed-circuit operation is executed under normal conditions in the third embodiment. [Figure 5] FIG. 5 is a diagram schematically showing a main part of a circuit breaker system according to the fourth embodiment. [Figure 6A] FIG. 6A is a perspective view schematically showing a main part of an operating mechanism 28 for operating a main contact part in the related art. [Figure 6B] FIG. 6B is a perspective view schematically showing a main part of an operating mechanism 28 for operating a main contact part in the related art. [Figure 6C] FIG. 6C is a perspective view schematically showing a main part of an operating mechanism 28 for operating a main contact part in the related art.

MODE FOR CARRYING OUT THE INVENTION

[0015] <First Embodiment> [A] Configuration of Circuit Breaker System FIG. 1A is a diagram schematically showing a main part of a circuit breaker system according to the first embodiment. In FIG. 1A, the case of performing a closed-circuit operation is illustrated. Although some illustrations of the part for performing an open-circuit operation are omitted, it is configured in the same manner as the part for performing a closed-circuit operation.

[0016] As shown in FIG. 1A, the circuit breaker system of the present embodiment includes a circuit breaker 12 and a circuit breaker operation control device 17, and is configured such that the operation of the circuit breaker 12 is controlled by the circuit breaker operation control device 17.

[0017] [A-1] Circuit Breaker 12 As shown in FIG. 1A, the circuit breaker 12 includes a main contact part 13, an operating mechanism 28, and a circuit breaker control circuit part 24, and is configured such that the circuit breaker control circuit part 24 controls the operation of the operating mechanism 28, and the operating mechanism 28 operates the main contact part 13.

[0018] [A-1-1] Main Contact Part 13 As shown in Figure 1A, the main contact section 13 is provided in the power system 11 and is configured to perform both closing operations (on-off operations) and opening operations (off-off operations). In a closing operation, the circuit of the power system 11 is switched from an open state to a closed state. In an opening operation, the circuit of the power system 11 is switched from a closed state to an open state.

[0019] [A-1-2] Operating mechanism 28 As shown in Figure 1A, the operating mechanism 28 includes a catch 25 (operation trigger unit) and a main mechanism unit 27, and is configured to operate the main contact unit 13 by transmitting the operating force of the main mechanism unit 27 to the main contact unit 13 via the catch 25.

[0020] The operating mechanism 28 includes a first closing-operation biasing drive solenoid 26A and a second closing-operation biasing drive solenoid 26B, similar to the case of related technologies (see Figure 6A).

[0021] In the operating mechanism 28, the first biasing drive solenoid 26A for closing the circuit is configured to perform a closing operation by driving the catch 25. Here, when the operating mechanism 28 performs a closing operation, the first closing operation control command S33A is input to the first biasing drive solenoid 26A from the circuit breaker control circuit unit 24. The first biasing drive solenoid 26A is configured to perform a closing operation by switching from a demagnetized state DM to an excited state EC in response to the first closing operation control command S33A.

[0022] In the operating mechanism 28, the second biasing drive solenoid 26B for closing the circuit is configured to perform a closing operation by driving the catch 25. Here, when the operating mechanism 28 performs a closing operation, the second closing operation control command S33B is input from the circuit breaker control circuit unit 24 to the second biasing drive solenoid 26B. The second biasing drive solenoid 26B is configured to perform a closing operation by switching from a demagnetized state DM to an excited state EC in response to the second closing operation control command S33B.

[0023] [A-1-3] Circuit breaker control circuit section 24 As shown in Figure 1A, the circuit breaker control circuit unit 24 includes a first closing operation anti-pumping unit 33A and a second closing operation anti-pumping unit 33B. The circuit breaker control circuit unit 24 includes, for example, an arithmetic unit (not shown) and a memory device (not shown), and each unit is configured to operate when the arithmetic unit performs calculation processing using a program stored in the memory device.

[0024] The first closing operation anti-pumping unit 33A and the second closing operation anti-pumping unit 33B are composed of anti-pumping circuits. The first closing operation anti-pumping unit 33A and the second closing operation anti-pumping unit 33B are provided to maintain the open state without performing a closing operation when the first closing operation command S14A and the second closing operation command S14B are still in effect after the completion of the closing operation (closing operation), and an opening operation command (not shown) for performing an opening operation (breaking operation) is input to the circuit breaker operation control device 17 and the opening operation is performed.

[0025] [A-1-3-1] First closing operation anti-pumping section 33A In the circuit breaker control circuit unit 24, as shown in Figure 1A, the first closing operation anti-pumping unit 33A receives a first closing operation control signal S19A from the circuit breaker operation control device 17, along with a main contact state signal S13 relating to the state of the main contact unit 13. Based on the first closing operation control signal S19A and the main contact state signal S13, the first closing operation anti-pumping unit 33A is configured to drive the first closing operation biasing drive solenoid 26A by outputting a first closing operation control command S33A to the first closing operation biasing drive solenoid 26A.

[0026] Figure 1B is a schematic diagram showing the configuration of the first closing operation anti-pumping unit 33A in the circuit breaker system according to the first embodiment.

[0027] The first anti-pumping unit 33A for closing the circuit includes a contact 31A, a b contact 32A, an auxiliary relay 35A, an auxiliary relay a contact 36A, and an auxiliary relay b contact 37A, as shown in Figure 1B. The first anti-pumping unit 33A for closing the circuit also includes a biasing drive solenoid line L1A, an auxiliary relay line L2A, and a connecting line L3A.

[0028] In the first closing operation anti-pumping section 33A, one end of the biasing drive solenoid line L1A is connected to the reference potential line N via node N1A, and the other end is connected to the node to which the first closing operation control signal S19A is input. On the biasing drive solenoid line L1A, a b-contact 32A, the first closing operation biasing drive solenoid 26A, and an auxiliary relay b-contact 37A are sequentially installed from the node N1A side. In addition, on the biasing drive solenoid line L1A, nodes L11A and L12A are sequentially provided between the auxiliary relay b-contact 37A and the node to which the first closing operation control signal S19A is input, starting from the node N1A side.

[0029] In the first closed-circuit operation anti-pumping section 33A, one end of the auxiliary relay line L2A is connected to the reference potential line N via node N2A, and the other end is connected to the biasing drive solenoid line L1A via node L12A. The auxiliary relay line L2A has an auxiliary relay 35A and a normally open contact 31A installed sequentially from the node N2A side. Furthermore, node L21A is provided between the auxiliary relay 35A and the normally open contact 31A in the auxiliary relay line L2A.

[0030] In the first closed-circuit operation anti-pumping section 33A, one end of the connecting line L3A is connected to the auxiliary relay line L2A via node L21A, and the other end is connected to the biasing drive solenoid line L1A via node L11A. The connecting line L3A is provided with an auxiliary relay normally open contact 36A.

[0031] In the first circuit closing anti-pumping unit 33A, the operation of the a-contact 31A and b-contact 32A is linked to the main contact unit 13. The operation of the auxiliary relay 35A, the auxiliary relay a-contact 36A, and the auxiliary relay b-contact 37A are linked to the state of the first circuit closing control signal S19A and the operation of the a-contact 31A.

[0032] Specifically, the normally open (a) contact 31A switches from OFF to ON when the main contact section 13 completes the switch from the open state to the closed state. Furthermore, the normally open (a) contact 31A returns from ON to OFF when the main contact section 13 begins the switch from the closed state to the open state.

[0033] The normally closed (b) contact 32A switches from ON to OFF at a point between the start of the switching from the open state to the closed state in the main contact section 13 and the completion of the switching from the open state to the closed state in the main contact section 13. Furthermore, the normally closed (b) contact 32A returns from OFF to ON at a point between the start of the switching from the closed state to the open state in the main contact section 13 and the completion of the switching from the closed state to the open state in the main contact section 13.

[0034] When the a-contact 31A is ON and the first closing operation control signal S19A is a HIGH signal that closes the circuit, auxiliary relay 35A switches from OFF to ON, auxiliary relay a-contact 36A switches from ON to OFF, and auxiliary relay b-contact 37A switches from OFF to ON. Then, when the first closing operation control signal S19A switches from a HIGH signal to a LOW signal, auxiliary relay 35A switches from ON to OFF, auxiliary relay a-contact 36A is restored from OFF to ON, and auxiliary relay b-contact 37A is restored from ON to OFF.

[0035] [A-1-3-2] Second anti-pumping section 33B for closed-circuit operation In the circuit breaker control circuit 24, as shown in Figure 1A, the second closing operation anti-pumping unit 33B receives the second closing operation control signal S19B from the circuit breaker operation control device 17, along with the main contact state signal S13 regarding the state of the main contact unit 13. Based on the second closing operation control signal S19B and the main contact state signal S13, the second closing operation anti-pumping unit 33B is configured to drive the second closing operation biasing drive solenoid 26B by outputting a second closing operation control command S33B to the second closing operation biasing drive solenoid 26B.

[0036] Figure 1C is a schematic diagram showing the configuration of the second closing operation anti-pumping unit 33B in the circuit breaker system according to the first embodiment.

[0037] The second anti-pumping section 33B for closing the circuit includes a contact 31B, a b contact 32B, an auxiliary relay 35B, an auxiliary relay a contact 36B, and an auxiliary relay b contact 37B, as shown in Figure 1C. The second anti-pumping section 33B for closing the circuit also includes a biasing drive solenoid line L1B, an auxiliary relay line L2B, and a connecting line L3B.

[0038] In the second closing operation anti-pumping section 33B, the biasing drive solenoid line L1B has one end connected to the reference potential line N via node N1B, and the other end connected to the node to which the second closing operation control signal S19B is input. The biasing drive solenoid line L1B has, in order from the node N1B side, a b-contact 32B, the second closing operation biasing drive solenoid 26B, and an auxiliary relay b-contact 37B. In addition, in the biasing drive solenoid line L1B, nodes L11B and L12B are provided in order from the node N1B side between the auxiliary relay b-contact 37B and the node to which the second closing operation control signal S19B is input.

[0039] In the second closed-circuit operation anti-pumping section 33B, one end of the auxiliary relay line L2B is connected to the reference potential line N via node N2B, and the other end is connected to the biasing drive solenoid line L1B via node L12B. The auxiliary relay line L2B has an auxiliary relay 35B and an a-contact 31B installed sequentially from the node N2B side. Furthermore, node L21B is provided between the auxiliary relay 35B and the a-contact 31B in the auxiliary relay line L2B.

[0040] In the second closed-circuit operation anti-pumping section 33B, one end of the connecting line L3B is connected to the auxiliary relay line L2B via node L21B, and the other end is connected to the biasing drive solenoid line L1B via node L11B. The connecting line L3B is provided with an auxiliary relay normally open contact 36B.

[0041] In the second circuit closing operation anti-pumping unit 33B, the operation of the a-contact 31B and b-contact 32B is linked to the main contact unit 13. The operation of the auxiliary relay 35B, the auxiliary relay a-contact 36B, and the auxiliary relay b-contact 37B are linked to the state of the second circuit closing operation control signal S19B and the operation of the a-contact 31B.

[0042] The normally open (a) contact 31B switches from OFF to ON when the main contact section 13 completes the switch from the open state to the closed state. The normally open (a) contact 31B returns from ON to OFF when the main contact section 13 begins the switch from the closed state to the open state.

[0043] The normally closed (b) contact 32B switches from ON to OFF at a point between the start of the switching from the open state to the closed state in the main contact section 13 and the completion of the switching from the open state to the closed state in the main contact section 13. The normally closed (b) contact 32B returns from OFF to ON at a point between the start of the switching from the closed state to the open state in the main contact section 13 and the completion of the switching from the closed state to the open state in the main contact section 13.

[0044] When the a-contact 31B is ON and the second closing operation control signal S19B is a HIGH signal that closes the circuit, auxiliary relay 35B switches from OFF to ON, auxiliary relay a-contact 36B switches from ON to OFF, and auxiliary relay b-contact 37B switches from OFF to ON. Then, when the second closing operation control signal S19B switches from a HIGH signal to a LOW signal, auxiliary relay 35A switches from ON to OFF, auxiliary relay a-contact 36A is restored from OFF to ON, and auxiliary relay b-contact 37A is restored from ON to OFF.

[0045] [A-2] Circuit breaker operation control device 17 As shown in Figure 1A, the circuit breaker operation control device 17 includes an operation calculation unit 18, and is configured to control the operation of the circuit breaker 12 by the operation calculation unit 18. The circuit breaker operation control device 17 may also include, for example, an arithmetic unit (not shown) and a memory device (not shown), and each part may operate by the arithmetic unit performing calculations using a program stored in the memory device.

[0046] In the circuit breaker operation control device 17, the operation calculation unit 18 has a first closing operation control unit 19A and a second closing operation control unit 19B, and a power system phase signal S21 relating to the voltage phase in the power system 11 is input from the power system detector 21.

[0047] [A-2-1] First closing operation control section 19A When the first circuit closing operation control unit 19A performs a circuit closing operation, it receives a first circuit closing operation command S14A from the external protection system 14. Based on the first circuit closing operation command S14A and the power system phase signal S21, the first circuit closing operation control unit 19A outputs a first circuit closing operation control signal S19A to the first circuit closing operation anti-pumping unit 33A.

[0048] [A-2-2] Second closing operation control section 19B When the second closing operation control unit 19B performs a closing operation, it receives the second closing operation command S14B simultaneously with the first closing operation command S14A from the external protection system 14. Based on the second closing operation command S14B and the power system phase signal S21, the second closing operation control unit 19B outputs the second closing operation control signal S19B to the second closing operation anti-pumping unit 33B.

[0049] [B] Operation of the operating mechanism 28 Figure 1D is a schematic perspective view showing the main parts of the operating mechanism 28 that constitutes the circuit breaker 12 in the first embodiment. Figure 1D illustrates the case when the circuit closing operation is performed, similar to Figures 6A, 6B, and 6C.

[0050] The operation of the closing mechanism 28 in this embodiment will be explained with reference to Figure 6C, along with Figure 1D.

[0051] In the case of the related technology, when a closing operation is performed, as shown in Figure 6B, both the first closing operation biasing drive solenoid 26A and the second closing operation biasing drive solenoid 26B are driven simultaneously, the catch 25 which constitutes the operation trigger unit is pushed up, and the cam 251 is driven.

[0052] In contrast, in this embodiment, when a circuit closing operation is performed, as shown in Figure 1D, both the first circuit closing biasing drive solenoid 26A and the second circuit closing biasing drive solenoid 26B are not driven simultaneously.

[0053] In this embodiment, as shown in Figure 1D, first, in response to the first closing operation control command S33A, the first closing operation biasing drive solenoid 26A switches from the demagnetized state DM (see Figure 6A) to the excited state EC and is driven. As a result, the catch 25 is pushed up and the cam 251 is driven, and the operating force is transmitted to the main contact portion 13. Thus, in normal operation, in this embodiment, the closing operation is performed by driving the first closing operation biasing drive solenoid 26A.

[0054] In this embodiment, the driving force of the first closing-operation biasing drive solenoid 26A is set to be the sum of the driving force of the first closing-operation biasing drive solenoid 26A and the driving force of the second closing-operation biasing drive solenoid 26B, for example, in the case of the related technology (see Figure 6B). Therefore, in this embodiment, the driving time of the catch 25 is the same as in the case of the related technology.

[0055] In this embodiment, the second closing operation biasing drive solenoid 26B switches from a demagnetized state DM (see Figure 6A) to an excited state EC (see Figure 6C) and is driven in response to the second closing operation control signal S19B. Therefore, for example, if the first closing operation biasing drive solenoid 26A is not driven due to a wire break and the closing operation is not performed, the closing operation is performed by driving the second closing operation biasing drive solenoid 26B. In other words, for example, even if the first closing operation control command S33A is not input to the first closing operation biasing drive solenoid 26A, the second closing operation biasing drive solenoid 26B is driven based on the second closing operation control signal S19B, and the closing operation is performed. Thus, in the event of an abnormality, in this embodiment, the closing operation is performed by driving the second closing operation biasing drive solenoid 26B.

[0056] The second closing-operation biasing drive solenoid 26B in this embodiment is set to have a driving force similar to that of the first closing-operation biasing drive solenoid 26A, for example, in the case of related technology (see Figure 6B), which is the sum of the driving force of the first closing-operation biasing drive solenoid 26A and the driving force of the second closing-operation biasing drive solenoid 26B.

[0057] In this embodiment, unlike in related technologies, the drive time of the catch 25 is the same during normal and abnormal conditions. Therefore, in this embodiment, the reliability of the circuit breaker 12's operation can be improved compared to related technologies.

[0058] [C] Timing Chart In this embodiment, the timing chart for controlling the operation of the operating mechanism 28 will be described in two cases: one in which a closing operation is performed under normal circumstances, and another in which a closing operation is performed under abnormal circumstances when the first closing operation biasing drive solenoid 26A is not driven.

[0059] [C-1] Closing operation under normal conditions Figure 2A is a timing chart for when the closing operation is performed under normal conditions in the first embodiment.

[0060] As described above, in this embodiment, under normal conditions, the main contact portion 13 is operated by the drive of the first closing operation biasing drive solenoid 26A, and the closing operation is performed (see Figure 1D).

[0061] [C-1-1] Protection System 14 [C-1-1-1] First closing operation command S14A When performing a circuit closing operation, as shown in Figure 2A, the first circuit closing operation command S14A in the external protection system 14 switches from a LOW signal to set the circuit open state to a HIGH signal to set the circuit closed state at time t14a, and is output to the first circuit closing operation control unit 19A of the circuit breaker operation control device 17.

[0062] The first closing operation command S14A holds a HIGH signal until time t14b, which is after time t14a. Then, at time t14b, the first closing operation command S14A switches from a HIGH signal to a LOW signal.

[0063] [C-1-1-2] Second closing operation command S14B In the external protection system 14, the second closing operation command S14B, similar to the first closing operation command S14A, switches from a LOW signal to an open state to a HIGH signal to a closed state at time t14a and is output to the second closing operation control unit 19B of the circuit breaker operation control device 17.

[0064] Then, the second closing operation command S14B, like the first closing operation command S14A, holds a HIGH signal until time t14b, which is after time t14a, and switches from a HIGH signal to a LOW signal at time t14b.

[0065] [C-1-2] Circuit breaker operation control device 17 [C-1-2-1] First closing operation control signal S19A In the first closing operation control unit 19A of the circuit breaker operation control device 17, the first closing operation control signal S19A switches from a LOW signal to set the circuit open state to a HIGH signal to set the circuit closed state at time t19Aa, which is later than time t14a, based on the first closing operation command S14A and the power system phase signal S21, and is output to the first closing operation anti-pumping unit 33A which constitutes the circuit breaker control circuit unit 24. Time t19Aa is set so that time t13b (time of closing completion), when the circuit breaker 12 is set to a closed state by the drive of the first closing operation biasing drive solenoid 26A, coincides with the time when the voltage applied to the power system 11 reaches a predetermined phase (for example, zero).

[0066] Then, the first closing operation control signal S19A, based on the first closing operation command S14A, holds a HIGH signal until time t19Ab, which is after time t14b, and switches from a HIGH signal to a LOW signal at time t19Ab. The time between time t19Aa and time t19Ab is the same as the time between time t14a and time t14b.

[0067] [C-1-2-1] Second closing operation control signal S19B In the second closing operation control unit 19B of the circuit breaker operation control device 17, the second closing operation control signal S19B switches from a LOW signal to set the circuit open state to a HIGH signal to set the circuit closed state at time t19Ba, which is later than time t14a, based on the second closing operation command S14B and the power system phase signal S21, and is output to the second closing operation anti-pumping unit 33B which constitutes the circuit breaker control circuit unit 24. Time t19Ba is set so that time t13b (see Figure 2B), when the circuit breaker 12 is set to a closed state by the driving of the second closing operation biasing drive solenoid 26B, coincides with the time when the voltage applied to the power system 11 reaches a predetermined phase (for example, zero).

[0068] Then, the second closing operation control signal S19B, based on the second closing operation command S14B, holds a HIGH signal until time t19Bb, which is after time t14b, and switches from a HIGH signal to a LOW signal at time t19Bb. The time between time t19Ba and time t19Bb is the same as the time between time t14a and time t14b. Time t19Ba is the time when a delay time TD has elapsed from time t19Aa.

[0069] [C-1-3] Circuit breaker control circuit section 24 [C-1-3-1] First anti-pumping section 33A for closing operation In the first anti-pumping unit 33A for circuit closing operation, which constitutes the circuit breaker control circuit unit 24, a first circuit closing operation control command S33A is output to the first biasing drive solenoid 26A for circuit closing operation based on the first circuit closing operation control signal S19A. As a result, the first biasing drive solenoid 26A for circuit closing operation switches from the de-energized state DM to the energized state EC at time t19Aa. Consequently, at time t13a (the time of circuit closing start), after the circuit closing operation time TX has elapsed from time t19Aa, the main contact unit 13 starts the circuit closing operation. As a result, at time t13b, which is later than time t13a, the main contact unit 13 switches from the open state to the closed state.

[0070] In the first circuit closing anti-pumping unit 33A, at time t32a (time of b-contact switching) between time t13a (time of circuit closing start) and time t13b (time of circuit closing completion), the b-contact 32A switches from ON to OFF in conjunction with the main contact unit 13. As a result, the first circuit closing biasing drive solenoid 26A switches from the energized state EC to the de-energized state DM at time t32a.

[0071] Then, in the first closing operation anti-pumping unit 33A, at time t13b (the time when the a-contact switches, the time when closing is completed), the a-contact 31A switches from OFF to ON in conjunction with the main contact unit 13. At the same time, the auxiliary relay 35A switches from OFF to ON (the state of the solenoid switches), the auxiliary relay a-contact 36A switches from OFF to ON, and the auxiliary relay b-contact 37A switches from ON to OFF. The auxiliary relay 35A, the auxiliary relay a-contact 36A, and the auxiliary relay b-contact 37A switch as described above at the time (t19Aa or t13b) when the a-contact 31A is ON and the first closing operation control signal S19A is a HIGH signal that puts the auxiliary relay b-contact 37A into a closed state (Close).

[0072] Subsequently, at the point t19Ab when the first closing operation control signal S19A switches from a HIGH signal to a LOW signal, auxiliary relay 35A switches from ON to OFF, auxiliary relay a-contact 36A switches from ON to OFF, and auxiliary relay b-contact 37A switches from OFF to ON.

[0073] In the first circuit closing anti-pumping unit 33A, the period from time t13b to time t19Ab becomes the period AP1 in which the anti-pumping condition is met. In the first circuit closing anti-pumping unit 33A, the period AP1 in which the anti-pumping condition is met is the period in which the auxiliary relay 35A is ON, the auxiliary relay a-contact 36A is ON, and the auxiliary relay b-contact 37A is OFF.

[0074] The first closed-circuit operation control command S33A is issued before the period AP1 in which the anti-pumping condition is met, and holds a HIGH signal during the period from time t19Aa to time t32a. As a result, the first closed-circuit operation biasing drive solenoid 26A maintains the excited state EC during the period from time t19Aa to time t32a.

[0075] [C-1-3-2] Second anti-pumping section 33B for closed-circuit operation In the second closing operation anti-pumping unit 33B, which constitutes the circuit breaker control circuit unit 24, a second closing operation control command S33B is output to the second closing operation biasing drive solenoid 26B based on the second closing operation control signal S19B. However, the second closing operation biasing drive solenoid 26B does not switch from the de-energized state DM to the energized state EC at time t19Ba.

[0076] In the second anti-pumping section 33B for closing the circuit, at time t32a (the time of b-contact switching), the b-contact 32A switches from ON to OFF in conjunction with the main contact section 13.

[0077] Then, in the second closing operation anti-pumping unit 33B, at time t13b (the time when the a-contact switches, the time when closing is completed), the a-contact 31B switches from OFF to ON in conjunction with the main contact unit 13. At the same time, the auxiliary relay 35B switches from OFF to ON, the auxiliary relay a-contact 36B switches from OFF to ON, and the auxiliary relay b-contact 37B switches from ON to OFF. The auxiliary relay 35B, the auxiliary relay a-contact 36B, and the auxiliary relay b-contact 37B switch as described above at the time (t19Ba or t13b) when the a-contact 31B is ON and the second closing operation control signal S19B is a HIGH signal that puts the circuit in a closed state (Close).

[0078] Subsequently, at the point t19Bb when the closing operation control signal S19B of relay 2 switches from a HIGH signal to a LOW signal, auxiliary relay 35B switches from ON to OFF, auxiliary relay a-contact 36B switches from ON to OFF, and auxiliary relay b-contact 37B switches from OFF to ON.

[0079] In the second anti-pumping unit 33B for closing the circuit, the period from time t19Ba to time t19Bb becomes the period AP2 during which the anti-pumping condition is met. In the second anti-pumping unit 33B for closing the circuit, the period AP2 during which the anti-pumping condition is met is the period during which the auxiliary relay 35B is ON, the auxiliary relay a-contact 36B is ON, and the auxiliary relay b-contact 37B is OFF.

[0080] Since the period during which the second closing operation control signal S19B is a HIGH signal is the period AP2 during which the anti-pumping condition is met, the second closing operation control command S33B holds a LOW signal. As a result, the second closing operation biasing drive solenoid 26B maintains the demagnetized state DM.

[0081] [C-2] Closing circuit operation in abnormal conditions Figure 2B is a timing chart for the first embodiment, showing when the closing operation is performed in the event of an abnormality in which the first closing operation biasing drive solenoid 26A is not driven.

[0082] As described above, in this embodiment, in the event of an abnormality in which the first closing-operation biasing drive solenoid 26A is not driven, the main contact portion 13 is operated by the driving of the second closing-operation biasing drive solenoid 26B, and the closing operation is performed (see Figure 6C).

[0083] This section primarily explains the differences between the case where a closed circuit operation is performed during an abnormal situation and the case where a closed circuit operation is performed during a normal situation.

[0084] In the first circuit closing anti-pumping unit 33A, which constitutes the circuit breaker control circuit unit 24, a first circuit closing control command S33A is output to the first circuit closing bias drive solenoid 26A based on the first circuit closing control signal S19A. However, in some cases, a circuit closing control command may not be input to the first circuit closing bias drive solenoid 26A due to an abnormality such as a broken wire. In this case, unlike in the normal case, the first circuit closing bias drive solenoid 26A does not switch from the de-energized state DM to the energized state EC.

[0085] In the second closing operation anti-pumping unit 33B, which constitutes the circuit breaker control circuit unit 24, a second closing operation control command S33B is output to the second closing operation biasing drive solenoid 26B based on the second closing operation control signal S19B. As a result, the second closing operation biasing drive solenoid 26B switches from the demagnetized state DM to the excited state EC at time t19Ba. Consequently, at time t13a, after the closing operation time TX has elapsed from time t19Ba, the main contact unit 13 begins closing operation. As a result, at time t13b, which is later than time t13a, the main contact unit 13 switches from the open state to the closed state.

[0086] Accordingly, in the first anti-pumping unit 33A for closing the circuit, at time t32a, between time t13a and time t13b, the b-contact 32A switches from ON to OFF. Then, in the first anti-pumping unit 33A for closing the circuit, at time t13b, the a-contact 31A switches from OFF to ON, and the auxiliary relay 35A switches from OFF to ON. Along with this, the auxiliary relay a-contact 36A switches from OFF to ON, and the auxiliary relay b-contact 37A switches from ON to OFF.

[0087] Subsequently, in the first closing operation anti-pumping unit 33A, at time t19Ab, auxiliary relay 35A switches from ON to OFF, auxiliary relay a-contact 36A switches from ON to OFF, and auxiliary relay b-contact 37A switches from OFF to ON.

[0088] Furthermore, in the second anti-pumping unit 33B for closing the circuit, the b-contact 32A switches from ON to OFF at time t32a. As a result, the biasing drive solenoid 26B for closing the circuit switches from the energized state EC to the de-energized state DM at time t32a. Then, in the second anti-pumping unit 33B for closing the circuit, the a-contact 31B switches from OFF to ON at time t13b, and the auxiliary relay 35B switches from OFF to ON. Along with this, the auxiliary relay a-contact 36B switches from OFF to ON, and the auxiliary relay b-contact 37B switches from ON to OFF.

[0089] Subsequently, in the second closing operation anti-pumping section 33B, at time t19Ab, auxiliary relay 35B switches from ON to OFF, auxiliary relay a-contact 36B switches from ON to OFF, and auxiliary relay b-contact 37B switches from OFF to ON.

[0090] In the above case, in the first anti-pumping unit 33A for closing the circuit, the period from time t13b to time t19Ab becomes the period AP1 in which the anti-pumping condition is met. Also, in the second anti-pumping unit 33B for closing the circuit, the period from time t13b to time t19Bb becomes the period AP2 in which the anti-pumping condition is met.

[0091] [D] Summary As described above, in the circuit breaker system of this embodiment, the circuit breaker 12 is equipped with an operating mechanism 28. The operating mechanism 28 is configured to operate the main contact section 13 by transmitting the operating force of the main mechanism section 27 to the main contact section 13 via a catch 25, which is an operating trigger section. The operating mechanism 28 includes a first closing operation biasing drive solenoid 26A and a second closing operation biasing drive solenoid 26B. The first closing operation biasing drive solenoid 26A is configured to execute a closing operation by driving the catch 25 when it switches from a demagnetized state DM to an excited state EC. The second closing operation biasing drive solenoid 26B is configured to execute a closing operation by driving the catch 25 when it switches from a demagnetized state DM to an excited state EC.

[0092] In the circuit breaker system of this embodiment, the circuit breaker operation control device 17 comprises a first closing operation control unit 19A and a second closing operation control unit 19B. The first closing operation control unit 19A receives a first closing operation command S14A when executing a closing operation and outputs a first closing operation control signal S19A based on the first closing operation command S14A. The second closing operation control unit 19B receives a second closing operation command S14B simultaneously with the first closing operation command S14A when executing a closing operation and outputs a second closing operation control signal S19B based on the second closing operation command S14B.

[0093] The first closing operation control signal S19A is output from the first closing operation control unit 19A so that the first closing operation biasing drive solenoid 26A switches from the demagnetized state DM to the excited state EC at time t19Aa (the start time of the first solenoid drive). Thus, in this embodiment, under normal circumstances, the closing operation is performed by driving the first closing operation biasing drive solenoid 26A based on the first closing operation control signal S19A (see Figure 1D).

[0094] The second closing operation control signal S19B is output from the second closing operation control unit 19B so that the second closing operation biasing drive solenoid 26B switches from the demagnetized state DM to the excited state EC at time t19Ba (the start time of the second solenoid drive) after a delay time TD has elapsed from time t19Aa. The delay time TD is longer than the closing operation time TX between time t19Aa and time t13a (the start time of the first closing operation) when the execution of the closing operation is started in the main contact unit 13 in response to the first closing operation control signal S19A. As a result, in this embodiment, when the first closing operation biasing drive solenoid 26A is not driven based on the first closing operation control signal S19A and the closing operation is not executed (abnormal condition), the second closing operation biasing drive solenoid 26B is driven based on the second closing operation control signal S19B and the closing operation is executed (see Figure 6C).

[0095] Therefore, as described above, in this embodiment, the drive time of the catch 25 is the same between normal operation (see Figure 1D) and abnormal operation (see Figure 6C), unlike in related technologies. Consequently, in this embodiment, the reliability of the circuit breaker 12's operation can be improved compared to related technologies.

[0096] <Second Embodiment> [A] Timing Chart Figure 3A is a timing chart for the circuit breaker system of the second embodiment, when the circuit closing operation commands S14A and S14B are still in effect after the completion of the circuit closing operation, and the circuit opening operation commands S14AX and S14BX are received.

[0097] In this embodiment, the configuration of the circuit breaker system is the same as in the first embodiment (see Figure 1A). However, in this embodiment, the system receives circuit opening commands S14AX and S14BX to perform the circuit opening operation. Therefore, in this embodiment, a part of the timing chart differs from that of the first embodiment (see Figure 2A). For this reason, explanations of redundant items will be omitted as appropriate.

[0098] As shown in Figure 3A, in this embodiment, the first open operation command S14AX and the second open operation command S14BX are output from the external protection system 14 to the circuit breaker operation control device 17. Although not shown, the circuit breaker operation control device 17 has, for example, a first closing operation control unit (not shown) and a second opening operation control unit (not shown), and the first open operation command S14AX is input to the first closing operation control unit (not shown). The second open operation command S14BX is input to the second opening operation control unit (not shown). Then, based on the first open operation command S14AX and the second open operation command S14BX, an open operation control command (not shown) is output from the circuit breaker control circuit unit 24 to the operating mechanism 28, thereby operating the main contact unit 13 and executing the open operation.

[0099] Here, the first open-circuit operation command S14AX and the second open-circuit operation command S14BX switch from a LOW signal (Close) to a HIGH signal (Open) at time t14Xa. Time t14Xa is after time t13b.

[0100] Furthermore, the first open-circuit operation command S14AX and the second open-circuit operation command S14BX are continued after time t14Xa, and the signal switches from a HIGH signal (open) to a LOW signal (close) at time t14Xb. Time t14Xa is between time t13d and time t14b.

[0101] The main contact 13 starts the opening operation at time t13c (start of opening operation), which is after the opening operation time has elapsed from time t14Xa. As a result, at time t13d (completion of opening operation), which is after time t13c, the main contact 13 switches from the closed state to the open state.

[0102] At this time, in the first anti-pumping unit 33A for closing the circuit, at time t13c (time when the a-contact is restored, time when the circuit starts to open) when the main contact unit 13 begins switching from the closed state to the open state, the a-contact 31A switches from ON to OFF in conjunction with the main contact unit 13. Then, at time t32b (time when the b-contact is restored) between time t13c and time t13d, the b-contact 32A switches from OFF to ON in conjunction with the main contact unit 13. In the first anti-pumping unit 33A for closing the circuit, the period from time t13b to time t19Ab becomes the period AP1 during which the anti-pumping condition is met.

[0103] Similarly, in the second anti-pumping unit 33B for closing the circuit, at time t13c (the start of circuit opening), the a-contact 31B switches from ON to OFF in conjunction with the main contact unit 13. Then, at time t32b (the time of b-contact restoration), between time t13c and time t13d, the b-contact 32B switches from OFF to ON in conjunction with the main contact unit 13. In the second anti-pumping unit 33B for closing the circuit, the period from time t19Ba to time t19Bb becomes the period AP2 during which the anti-pumping condition is met.

[0104] In this embodiment, the time t19Ba at which the second closing operation bias drive solenoid 26B switches from the demagnetized state DM to the excited state EC in response to the second closing operation control signal S19B is the period TY between time t32a and time t13c. This makes it possible to accurately implement anti-pumping in this embodiment. In other words, in this embodiment, even if the opening operation commands S14AX and S14BX are input and the execution of the opening operation is completed while the closing operation commands S14A and S14B are still in effect after the completion of the closing operation, the closing operation is not restarted in response to the closing operation commands S14A and S14B, and the open state can be maintained.

[0105] [B] Timing chart of comparative example Figure 3B is a timing chart for the comparative example, where, after the completion of the closing operation, the closing operation commands S14A and S14B are still in effect, and the opening operation commands S14AX and S14BX are received to execute the opening operation. Figure 3B shows the case where the time t19Ba at which the second closing operation biasing drive solenoid 26B switches from the demagnetized state DM to the excited state EC by the second closing operation control signal S19B is not the period TY between time t32a and time t13c.

[0106] As shown in Figure 3B, if time t19Ba is not the period TY between time t32a and time t13c, then the closing operation in which the main contact portion 13 switches from the open state to the closed state is started again at time t13e, which is after time t13d, and is completed at time t13f.

[0107] Specifically, in the first anti-pumping unit 33A for closing the circuit, at time t32b, the b-contact 32A switches from OFF to ON in conjunction with the main contact unit 13. Similarly, in the second anti-pumping unit 33B for closing the circuit, at time t32b, the b-contact 32B switches from OFF to ON in conjunction with the main contact unit 13. Then, at time t32b, the second closing operation control command S33B switches the second biasing drive solenoid 26B for closing the circuit from the de-energized state DM to the energized state EC.

[0108] Furthermore, in the first anti-pumping unit 33A for closing the circuit, at time t32c, the b-contact 32A switches from ON to OFF in conjunction with the main contact unit 13. Similarly, in the second anti-pumping unit 33B for closing the circuit, at time t32c, the b-contact 32B switches from ON to OFF in conjunction with the main contact unit 13. Then, at time t32c, the second closing operation control command S33B switches the second biasing drive solenoid 26B for closing the circuit from the energized state EC to the de-energized state DM.

[0109] Thus, in this comparative example, unlike in this embodiment, if the closing operation commands S14A and S14B are still in effect after the completion of the closing operation, and the opening operation commands S14AX and S14BX are input and the execution of the opening operation is completed, the closing operation may be restarted in accordance with the closing operation commands S14A and S14B. In other words, in the comparative example, a pumping operation may occur, making it difficult to prevent the expansion of a system fault.

[0110] [C] Summary As described above, in this embodiment, the second loop operation control signal S19B is output from the second loop operation control unit 19B such that time point t19Ba is between time point t32a and time point t13c (t32a to t13c).

[0111] Therefore, in this embodiment, anti-pumping can be effectively achieved as described above.

[0112] <Third Embodiment> [A] Circuit breaker system configuration Figure 4A is a schematic diagram showing the main components of the circuit breaker system according to the third embodiment. In Figure 4A, as in Figure 1A, the case of closing the circuit is illustrated. Some parts of the part that performs the opening operation are omitted from the illustration, but it is configured in the same way as the part that performs the closing operation.

[0113] In this embodiment, the circuit breaker system includes a determination unit 181 in the circuit breaker operation control device 17. Except for this point and related points, this embodiment is the same as the first embodiment (see Figure 1A). Therefore, explanations of overlapping matters will be omitted as appropriate.

[0114] In the circuit breaker operation control device 17 of this embodiment, the determination unit 181 is provided to determine whether or not a circuit closing operation has been performed in response to the first circuit closing operation control signal S19A. The determination unit 181 is configured to receive a main contact state signal S13 relating to the state of the main contact unit 13 and to make a determination in response to the main contact state signal S13.

[0115] [B] Timing Chart In this embodiment, a timing chart for controlling the operation of the operating mechanism 28 will be described.

[0116] Figure 4B is a timing chart for when the closing operation is performed under normal conditions in the third embodiment.

[0117] As described above, under normal conditions, the main contact portion 13 is operated by the drive of the first closing-operation biasing drive solenoid 26A, and the closing operation is performed (see Figure 1D). The main contact portion 13 starts the closing operation at time t13a and completes the closing operation at time t13b, switching from the open state to the closed state (see Figure 4B).

[0118] As a result, in the first anti-pumping unit 33A for closing the circuit, which constitutes the circuit breaker control circuit unit 24, the b-contact 32A switches from ON to OFF in conjunction with the main contact unit 13 at time t32a. Then, in the first anti-pumping unit 33A for closing the circuit, the a-contact 31A switches from OFF to ON in conjunction with the main contact unit 13 at time t13b.

[0119] Furthermore, in the second anti-pumping unit 33B for circuit closing operation, which constitutes the circuit breaker control circuit unit 24, the b-contact 32A switches from ON to OFF in conjunction with the main contact unit 13 at time t32a. Then, in the second anti-pumping unit 33B for circuit closing operation, the a-contact 31B switches from OFF to ON in conjunction with the main contact unit 13 at time t13b.

[0120] In this embodiment, the determination unit 181 (see Figure 4A) receives a signal related to the switching operation of, for example, the a-contact 31A and the a-contact 31B as the main contact state signal S13. The determination unit 181 then performs a determination according to the switching operation of the a-contact 31A and the a-contact 31B.

[0121] Specifically, when the normally open contacts 31A and 31B switch from OFF to ON in conjunction with the main contact unit 13 at time t13b, the determination unit 181 determines that a closing operation has been performed in accordance with the first closing operation control signal S19A.

[0122] Then, when the determination unit 181 determines that a closing operation has been performed in response to the first closing operation control signal S19A, the second closing operation control unit 19B cancels the operation in which the second closing operation biasing drive solenoid 26B switches from the demagnetized state DM to the excited state EC at time t19Ba, and outputs the second closing operation control signal S19B so that the second closing operation biasing drive solenoid 26B maintains the demagnetized state DM. In other words, the second closing operation control signal S19B does not switch from a LOW signal to a HIGH signal, but maintains a LOW signal. For this reason, in the second closing operation anti-pumping unit 33B, the auxiliary relay 35B, the auxiliary relay a-contact 36B, and the auxiliary relay b-contact 37B maintain the following states: auxiliary relay 35B maintains OFF, auxiliary relay a-contact 36B maintains OFF, and auxiliary relay b-contact 37B maintains ON.

[0123] Although not shown in the diagram, when the determination unit 181 determines that the closing operation was not performed in response to the first closing operation control signal S19A, the second closing operation control unit 19B outputs a second closing operation control signal S19B, similar to the first embodiment. In other words, the second closing operation control signal S19B is output from the second closing operation control unit 19B at time t19Ba, after a delay time TD has elapsed from time t19Aa, so that the second closing operation biasing drive solenoid 26B switches from the demagnetized state DM to the excited state EC.

[0124] [C] Summary As described above, in this embodiment, as in the first embodiment, under normal circumstances, the first closing operation biasing drive solenoid 26A is driven based on the first closing operation control signal S19A, thereby executing the closing operation (see Figure 1D). Furthermore, if the first closing operation biasing drive solenoid 26A is not driven based on the first closing operation control signal S19A and the closing operation is not executed (abnormal circumstances), as in the first embodiment, the second closing operation biasing drive solenoid 26B is driven based on the second closing operation control signal S19B, thereby executing the closing operation (see Figure 6C). In this embodiment, the output of the second closing operation control signal S19B is controlled according to the result of the determination unit 181's determination of whether or not the closing operation was executed in response to the first closing operation control signal S19A.

[0125] Therefore, in this embodiment, it is possible to more accurately ensure that the drive time of the catch 25 is the same between normal operation (see Figure 1D) and abnormal operation (see Figure 6C). Consequently, this embodiment can improve the reliability of the operation of the circuit breaker 12.

[0126] In addition to the above, the determination unit 181 may also receive a main contact status signal S13, for example, a signal related to the switching operation of b-contacts 32A and 32B which are linked to the main contact unit 13, and perform the determination in the same manner.

[0127] Furthermore, although not shown in the diagram, in the case of the second embodiment as well, the output of the second closing operation control signal S19B is controlled according to the result determined by the determination unit 181, so a similar effect can be obtained.

[0128] <Fourth Embodiment> [A] Circuit breaker system configuration Figure 5 is a schematic diagram showing the main components of the circuit breaker system according to the fourth embodiment. In Figure 5, as in Figure 4A, the case of closing the circuit is illustrated. Some parts of the part that performs the opening operation are omitted from the illustration, but it is configured in the same way as the part that performs the closing operation.

[0129] In this embodiment, the circuit breaker system includes a notification unit 182 in the circuit breaker operation control device 17. Except for this point and related points, this embodiment is the same as the third embodiment (see Figure 1A). Therefore, explanations of overlapping matters will be omitted as appropriate.

[0130] In the circuit breaker operation control device 17 of this embodiment, the notification unit 182 is configured to provide notification when the determination unit 181 determines that a circuit closing operation has not been performed in response to the first circuit closing operation control signal S19A. The notification unit 182 provides notification by, for example, displaying information on a display that indicates that a circuit closing operation has not been performed in response to the first circuit closing operation control signal S19A. Alternatively, the notification unit 182 may be configured to provide notification by, for example, outputting sound.

[0131] [B] Summary As described above, in this embodiment, the notification unit 182 provides notification, allowing the user to easily understand when an abnormality occurs.

[0132] <Other> While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These embodiments can be carried out in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents. [Explanation of symbols]

[0133] 11: Power system, 12: Circuit breaker, 13: Main contact section, 14: Protection system, 17: Circuit breaker operation control device, 18: Operation calculation unit, 19A: First closing operation control unit, 19B: Second closing operation control unit, 21: Power system detector, 24: Circuit breaker control circuit section, 25: Catch (operation trigger section), 26A: First biasing drive solenoid, 26B: Second biasing drive solenoid for closing operation, 27: Main mechanism section, 28: Operating mechanism, 31A: a-contact, 31B: a-contact, 32A: b-contact, 32B: b-contact, 33A: Anti-pumping section for first closing operation, 33B: Anti-pumping section for second closing operation, 35A: Auxiliary Relay, 35B: Auxiliary relay, 36A: Auxiliary relay a-contact, 36B: Auxiliary relay a-contact, 37A: Auxiliary relay b-contact, 37B: Auxiliary relay b-contact, 181: Determination unit, 182: Notification unit, 251: Cam, t19Aa: Time (start of first solenoid drive), t19Ba: Time (start of second solenoid drive), t13a: Time (start of closing), t13b: Time (time of a-contact switching, closing completed), t13c: Time (time of a-contact restoration, opening started), t13d: Time (time of opening completed), t32a: Time (time of b-contact switching), t32b: Time (time of b-contact restoration), TD: Delay time

Claims

1. Circuit breaker and, A circuit breaker operation control device for controlling the operation of the circuit breaker and A circuit breaker system comprising, The aforementioned circuit breaker is A main contact section is provided in a power system and is configured to perform a closing operation in the power system to switch from an open state to a closed state, and to perform an opening operation in the power system to switch from a closed state to an open state. An operating mechanism is configured to operate the main contact by transmitting the operating force of the main mechanism to the main contact via the operating trigger unit. Equipped with, The aforementioned operating mechanism is A first biasing drive solenoid for closing the circuit, which drives the operation trigger unit by switching from a demagnetized state to an energized state, thereby executing the closing operation, A second biasing drive solenoid for closing the circuit executes the closing operation by driving the operation trigger unit by switching from a demagnetized state to an energized state. Includes, The circuit breaker operation control device is A first closing operation control unit is configured to receive a first closing operation command when executing the closing operation, and to output a first closing operation control signal based on the first closing operation command. A second closing operation control unit is configured to receive a second closing operation command simultaneously with the first closing operation command when executing the closing operation, and to output a second closing operation control signal based on the second closing operation command. Equipped with, The first closing operation control signal is output from the first closing operation control unit so that the first closing operation biasing drive solenoid switches from a demagnetized state to an excited state at the start of the first solenoid drive. The second closing operation control signal is output from the second closing operation control unit so that the second closing operation biasing drive solenoid switches from a demagnetized state to an excited state at the start of the second solenoid drive, after a delay time has elapsed from the start of the first solenoid drive. The delay time is longer than the closing operation time between the start of the first solenoid drive and the start of the closing operation at the main contact portion in response to the first closing operation control signal. If the first closing operation biasing drive solenoid is not driven based on the first closing operation control signal and the closing operation is not performed, the second closing operation biasing drive solenoid is driven based on the second closing operation control signal and the closing operation is performed. Circuit breaker system.

2. The aforementioned circuit breaker is A first closing operation anti-pumping unit is configured to drive the first closing operation biasing drive solenoid by outputting a first closing operation control command to the first closing operation biasing drive solenoid based on the first closing operation control signal and the main contact state signal relating to the state of the main contact part, A second anti-pumping unit for closing the circuit is configured to drive the second biasing drive solenoid for closing the circuit by outputting a second closing operation control command to the second biasing drive solenoid for closing the circuit in response to the second closing operation control signal and the main contact state signal, It has, When the first closing operation command and the second closing operation command remain in effect after the completion of the closing operation, and an opening operation command for the opening operation is input to the circuit breaker operation control device and the opening operation is executed, the first closing operation anti-pumping unit outputs the first closing operation control command and the second closing operation anti-pumping unit outputs the second closing operation control command so that the open state is maintained. The circuit breaker system according to claim 1.

3. The first anti-pumping unit for closing the circuit and the second anti-pumping unit for closing the circuit are, An a-contact, which is linked to the main contact, switches from OFF to ON at the time of a-contact switching when the switching from the open state to the closed state is completed at the main contact, and returns from ON to OFF at the time of a-contact restoration when the switching from the closed state to the open state begins at the main contact, The b-contact, which is linked to the main contact, switches from ON to OFF at the b-contact switching point, which is between the closing start point when the switching from the open state to the closed state begins at the main contact and the a-contact switching point, and returns from OFF to ON at the b-contact restoring point, which is between the a-contact restoration point and the opening completion point when the switching from the closed state to the open state is completed at the main contact. Includes, The second closing operation control signal is output from the second closing operation control unit such that the start time of the second solenoid drive is between the time of the b-contact switching and the time of the a-contact restoration. The circuit breaker system according to claim 2.

4. The circuit breaker operation control device is A determination unit determines whether the closing operation was performed in accordance with the first closing operation control signal, based on the switching operation of the a-contact or the switching operation of the b-contact. It has, When the determination unit determines that the closing operation has been performed in response to the first closing operation control signal, the second closing operation control unit cancels the operation in which the second closing operation biasing drive solenoid switches from a demagnetized state to an energized state at the start of the second solenoid drive, and outputs the second closing operation control signal so that the second closing operation biasing drive solenoid maintains a demagnetized state. The circuit breaker system according to claim 3.

5. The circuit breaker operation control device is A determination unit determines whether the closing operation was performed in accordance with the first closing operation control signal, based on the switching operation of the a-contact or the switching operation of the b-contact, When the determination unit determines that the closing operation has not been performed in response to the first closing operation control signal, the notification unit provides notification. Equipped with, The circuit breaker system according to claim 3.

6. A main contact section is provided in a power system and is configured to perform a closing operation in the power system to switch from an open state to a closed state, and to perform an opening operation in the power system to switch from a closed state to an open state. An operating mechanism is configured to operate the main contact by transmitting the operating force of the main mechanism to the main contact via the operating trigger unit. Equipped with, The aforementioned operating mechanism is A first biasing drive solenoid for closing the circuit, which drives the operation trigger unit by switching from a demagnetized state to an energized state, thereby executing the closing operation, A second biasing drive solenoid for closing the circuit executes the closing operation by driving the operation trigger unit by switching from a demagnetized state to an energized state. A circuit breaker operation control device for controlling the operation of a circuit breaker, including, A first closing operation control unit is configured to receive a first closing operation command when executing the closing operation, and to output a first closing operation control signal based on the first closing operation command. A second closing operation control unit is configured to receive a second closing operation command simultaneously with the first closing operation command when executing the closing operation, and to output a second closing operation control signal based on the second closing operation command. Equipped with, The first closing operation control signal is output from the first closing operation control unit so that the first closing operation biasing drive solenoid switches from a demagnetized state to an excited state at the start of the first solenoid drive. The second closing operation control signal is output from the second closing operation control unit so that the second closing operation biasing drive solenoid switches from a demagnetized state to an excited state at the start of the second solenoid drive, after a delay time has elapsed from the start of the first solenoid drive. The delay time is longer than the closing operation time between the start of the first solenoid drive and the start of the closing operation at the main contact portion in response to the first closing operation control signal. If the first closing operation biasing drive solenoid is not driven based on the first closing operation control signal and the closing operation is not performed, the second closing operation biasing drive solenoid is driven based on the second closing operation control signal and the closing operation is performed. Circuit breaker operation control device.

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